{
  "manageEntity": {
    "action": "Save",
    "entityId": "878472001",
    "entityType": "Track",
    "nonce": "0x0608943ad236e4ea40ba2d6412c691db02c8ffeedf713980015552242d75129b",
    "signature": "0x1cbb7f2dbd8c49eb6f7abe2d6bc55a3b11d2dbb1096e82842da7b46f418f600f26f72697c105feb5199183670d17e28004541d85241c7057817369c9158ff6021c",
    "signer": "0xC6f6979d7215C4611Cd7aDb30a42B2812294262c",
    "userId": "55290787"
  }
}